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10．Doctors have ________ their research in curing this kind of disease．（　�。�
A．shown upB．picked upC．stayed upD．stepped up

分析 醫(yī)生們已經加快了對于治愈這個疾病的研究．

解答 答案D．
根據賓語和狀語their research in curing this kind of disease可知醫(yī)生們已經加快了對于治愈這個疾病的研究，是個選項的含義分別是A"出現，露面"；B"撿起，開車接某人"；C"熬夜"；D"增快，加快"，所以答案是D．

點評 開車動詞短語辨析．step 的短語用法：
1．名詞短語：step by step adv．逐步地； first step 第一步，首要步驟； take steps 采取措施，采取步驟； in step 步調一致； next step 下一步．
2．動詞短語：step up 提高，增加；．step by 走過；step in 介入插手干預．

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